drm_ioctl.c revision 1.1.1.1.4.2
1 /** 2 * \file drm_ioctl.c 3 * IOCTL processing for DRM 4 * 5 * \author Rickard E. (Rik) Faith <faith (at) valinux.com> 6 * \author Gareth Hughes <gareth (at) valinux.com> 7 */ 8 9 /* 10 * Created: Fri Jan 8 09:01:26 1999 by faith (at) valinux.com 11 * 12 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. 13 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. 14 * All Rights Reserved. 15 * 16 * Permission is hereby granted, free of charge, to any person obtaining a 17 * copy of this software and associated documentation files (the "Software"), 18 * to deal in the Software without restriction, including without limitation 19 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 20 * and/or sell copies of the Software, and to permit persons to whom the 21 * Software is furnished to do so, subject to the following conditions: 22 * 23 * The above copyright notice and this permission notice (including the next 24 * paragraph) shall be included in all copies or substantial portions of the 25 * Software. 26 * 27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 28 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 29 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 30 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 31 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 32 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 33 * OTHER DEALINGS IN THE SOFTWARE. 34 */ 35 36 #include <drm/drmP.h> 37 #include <drm/drm_core.h> 38 39 #include <linux/pci.h> 40 #include <linux/export.h> 41 42 /** 43 * Get the bus id. 44 * 45 * \param inode device inode. 46 * \param file_priv DRM file private. 47 * \param cmd command. 48 * \param arg user argument, pointing to a drm_unique structure. 49 * \return zero on success or a negative number on failure. 50 * 51 * Copies the bus id from drm_device::unique into user space. 52 */ 53 int drm_getunique(struct drm_device *dev, void *data, 54 struct drm_file *file_priv) 55 { 56 struct drm_unique *u = data; 57 struct drm_master *master = file_priv->master; 58 59 if (u->unique_len >= master->unique_len) { 60 if (copy_to_user(u->unique, master->unique, master->unique_len)) 61 return -EFAULT; 62 } 63 u->unique_len = master->unique_len; 64 65 return 0; 66 } 67 68 static void 69 drm_unset_busid(struct drm_device *dev, 70 struct drm_master *master) 71 { 72 kfree(dev->devname); 73 dev->devname = NULL; 74 75 kfree(master->unique); 76 master->unique = NULL; 77 master->unique_len = 0; 78 master->unique_size = 0; 79 } 80 81 /** 82 * Set the bus id. 83 * 84 * \param inode device inode. 85 * \param file_priv DRM file private. 86 * \param cmd command. 87 * \param arg user argument, pointing to a drm_unique structure. 88 * \return zero on success or a negative number on failure. 89 * 90 * Copies the bus id from userspace into drm_device::unique, and verifies that 91 * it matches the device this DRM is attached to (EINVAL otherwise). Deprecated 92 * in interface version 1.1 and will return EBUSY when setversion has requested 93 * version 1.1 or greater. 94 */ 95 int drm_setunique(struct drm_device *dev, void *data, 96 struct drm_file *file_priv) 97 { 98 struct drm_unique *u = data; 99 struct drm_master *master = file_priv->master; 100 int ret; 101 102 if (master->unique_len || master->unique) 103 return -EBUSY; 104 105 if (!u->unique_len || u->unique_len > 1024) 106 return -EINVAL; 107 108 if (!dev->driver->bus->set_unique) 109 return -EINVAL; 110 111 ret = dev->driver->bus->set_unique(dev, master, u); 112 if (ret) 113 goto err; 114 115 return 0; 116 117 err: 118 drm_unset_busid(dev, master); 119 return ret; 120 } 121 122 static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv) 123 { 124 struct drm_master *master = file_priv->master; 125 int ret; 126 127 if (master->unique != NULL) 128 drm_unset_busid(dev, master); 129 130 ret = dev->driver->bus->set_busid(dev, master); 131 if (ret) 132 goto err; 133 return 0; 134 err: 135 drm_unset_busid(dev, master); 136 return ret; 137 } 138 139 /** 140 * Get a mapping information. 141 * 142 * \param inode device inode. 143 * \param file_priv DRM file private. 144 * \param cmd command. 145 * \param arg user argument, pointing to a drm_map structure. 146 * 147 * \return zero on success or a negative number on failure. 148 * 149 * Searches for the mapping with the specified offset and copies its information 150 * into userspace 151 */ 152 int drm_getmap(struct drm_device *dev, void *data, 153 struct drm_file *file_priv) 154 { 155 struct drm_map *map = data; 156 struct drm_map_list *r_list = NULL; 157 struct list_head *list; 158 int idx; 159 int i; 160 161 idx = map->offset; 162 if (idx < 0) 163 return -EINVAL; 164 165 i = 0; 166 mutex_lock(&dev->struct_mutex); 167 list_for_each(list, &dev->maplist) { 168 if (i == idx) { 169 r_list = list_entry(list, struct drm_map_list, head); 170 break; 171 } 172 i++; 173 } 174 if (!r_list || !r_list->map) { 175 mutex_unlock(&dev->struct_mutex); 176 return -EINVAL; 177 } 178 179 map->offset = r_list->map->offset; 180 map->size = r_list->map->size; 181 map->type = r_list->map->type; 182 map->flags = r_list->map->flags; 183 map->handle = (void *)(unsigned long) r_list->user_token; 184 map->mtrr = r_list->map->mtrr; 185 mutex_unlock(&dev->struct_mutex); 186 187 return 0; 188 } 189 190 /** 191 * Get client information. 192 * 193 * \param inode device inode. 194 * \param file_priv DRM file private. 195 * \param cmd command. 196 * \param arg user argument, pointing to a drm_client structure. 197 * 198 * \return zero on success or a negative number on failure. 199 * 200 * Searches for the client with the specified index and copies its information 201 * into userspace 202 */ 203 int drm_getclient(struct drm_device *dev, void *data, 204 struct drm_file *file_priv) 205 { 206 struct drm_client *client = data; 207 struct drm_file *pt; 208 int idx; 209 int i; 210 211 idx = client->idx; 212 i = 0; 213 214 mutex_lock(&dev->struct_mutex); 215 list_for_each_entry(pt, &dev->filelist, lhead) { 216 if (i++ >= idx) { 217 client->auth = pt->authenticated; 218 client->pid = pid_vnr(pt->pid); 219 client->uid = from_kuid_munged(current_user_ns(), pt->uid); 220 client->magic = pt->magic; 221 client->iocs = pt->ioctl_count; 222 mutex_unlock(&dev->struct_mutex); 223 224 return 0; 225 } 226 } 227 mutex_unlock(&dev->struct_mutex); 228 229 return -EINVAL; 230 } 231 232 /** 233 * Get statistics information. 234 * 235 * \param inode device inode. 236 * \param file_priv DRM file private. 237 * \param cmd command. 238 * \param arg user argument, pointing to a drm_stats structure. 239 * 240 * \return zero on success or a negative number on failure. 241 */ 242 int drm_getstats(struct drm_device *dev, void *data, 243 struct drm_file *file_priv) 244 { 245 struct drm_stats *stats = data; 246 int i; 247 248 memset(stats, 0, sizeof(*stats)); 249 250 for (i = 0; i < dev->counters; i++) { 251 if (dev->types[i] == _DRM_STAT_LOCK) 252 stats->data[i].value = 253 (file_priv->master->lock.hw_lock ? file_priv->master->lock.hw_lock->lock : 0); 254 else 255 stats->data[i].value = atomic_read(&dev->counts[i]); 256 stats->data[i].type = dev->types[i]; 257 } 258 259 stats->count = dev->counters; 260 261 return 0; 262 } 263 264 /** 265 * Get device/driver capabilities 266 */ 267 int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv) 268 { 269 struct drm_get_cap *req = data; 270 271 req->value = 0; 272 switch (req->capability) { 273 case DRM_CAP_DUMB_BUFFER: 274 if (dev->driver->dumb_create) 275 req->value = 1; 276 break; 277 case DRM_CAP_VBLANK_HIGH_CRTC: 278 req->value = 1; 279 break; 280 case DRM_CAP_DUMB_PREFERRED_DEPTH: 281 req->value = dev->mode_config.preferred_depth; 282 break; 283 case DRM_CAP_DUMB_PREFER_SHADOW: 284 req->value = dev->mode_config.prefer_shadow; 285 break; 286 case DRM_CAP_PRIME: 287 req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0; 288 req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0; 289 break; 290 case DRM_CAP_TIMESTAMP_MONOTONIC: 291 req->value = drm_timestamp_monotonic; 292 break; 293 default: 294 return -EINVAL; 295 } 296 return 0; 297 } 298 299 /** 300 * Setversion ioctl. 301 * 302 * \param inode device inode. 303 * \param file_priv DRM file private. 304 * \param cmd command. 305 * \param arg user argument, pointing to a drm_lock structure. 306 * \return zero on success or negative number on failure. 307 * 308 * Sets the requested interface version 309 */ 310 int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv) 311 { 312 struct drm_set_version *sv = data; 313 int if_version, retcode = 0; 314 315 if (sv->drm_di_major != -1) { 316 if (sv->drm_di_major != DRM_IF_MAJOR || 317 sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) { 318 retcode = -EINVAL; 319 goto done; 320 } 321 if_version = DRM_IF_VERSION(sv->drm_di_major, 322 sv->drm_di_minor); 323 dev->if_version = max(if_version, dev->if_version); 324 if (sv->drm_di_minor >= 1) { 325 /* 326 * Version 1.1 includes tying of DRM to specific device 327 * Version 1.4 has proper PCI domain support 328 */ 329 retcode = drm_set_busid(dev, file_priv); 330 if (retcode) 331 goto done; 332 } 333 } 334 335 if (sv->drm_dd_major != -1) { 336 if (sv->drm_dd_major != dev->driver->major || 337 sv->drm_dd_minor < 0 || sv->drm_dd_minor > 338 dev->driver->minor) { 339 retcode = -EINVAL; 340 goto done; 341 } 342 343 if (dev->driver->set_version) 344 dev->driver->set_version(dev, sv); 345 } 346 347 done: 348 sv->drm_di_major = DRM_IF_MAJOR; 349 sv->drm_di_minor = DRM_IF_MINOR; 350 sv->drm_dd_major = dev->driver->major; 351 sv->drm_dd_minor = dev->driver->minor; 352 353 return retcode; 354 } 355 356 /** No-op ioctl. */ 357 int drm_noop(struct drm_device *dev, void *data, 358 struct drm_file *file_priv) 359 { 360 DRM_DEBUG("\n"); 361 return 0; 362 } 363 EXPORT_SYMBOL(drm_noop); 364
Indexes created Wed Oct 15 16:09:53 GMT 2025